EVALUATION
The designated method's javadoc says nothing about the expected
behaviour if we add the same listener twice.
###@###.### 2003-10-09
I checked with engineering on this. The issue is: if the same logger is added twice, and one is removed, will it remove both instances? Will fix with the following doc comment:
"Adding multiple instances of the same event Listener results in multiple entries in the property event listener table".
###@###.### 2003-11-24